fatal: [172.17.102.43]: FAILED! => {"changed": false, "msg": "A MySQL module is required: for Python 2.7 either PyMySQL, or MySQL-python, or for Python 3.X mysqlclient or PyMySQL. Consider setting ansible_python_interpreter to use the intended Python version."}

 

yum install MySQL-python

Useful notes for CKA exam

 

## Shortcuts to save time 

export do="--dry-run=client -o yaml"

export now="--force --grace-period 0"

k delete pod x $now

alias kn='kubectl config set-context --current --namespace '

kn my-namespace 

## JOIN KUBE CLUSTER ##

kubeadm token create --print-join-command

## Check Service CIDR ##

ssh cluster1-controlplane1

cat etc/kubernetes/manifests/kube-apiserver.yaml | grep range

## CNI Plugin is configured and where is its config file ##

find /etc/cni/net.d/

cat /etc/cni/net.d/10-weave.conflist

## Show Latest events ##

kubectl get events -A --sort-by=.metadata.creationTimestamp

### find pod running on cluster2-node1

k -n kube-system get pod -o wide | grep proxy 

## killing pod on a node 

  crictl ps | grep kube-proxy

        crictl stop e6fe93fbaec50

        crictl rm e6fe93fbaec50

        crictl ps | grep kube-proxy

## Write the names of all namespaced resources into file 

 k api-resources --namespaced -o name > /opt/course/16/resources.txt

## Check which namspace has more role (count )

  k -n <namespacename> get role --no-headers | wc -l

cat <<EOF | kubectl apply -f -

---

apiVersion: rbac.authorization.k8s.io/v1

kind: Role

metadata:

  name: app-role

  namespace: project-hamster

rules:

  - apiGroups:

        - ""

        - apps

        - autoscaling

        - batch

        - extensions

        - policy

        - rbac.authorization.k8s.io

    resources:

      - configmaps

      - secrets

    verbs: ["get", "list", "watch", "create", "update", "patch", "delete"]

EOF

cat <<EOF | kubectl apply -f -

---

apiVersion: rbac.authorization.k8s.io/v1

kind: RoleBinding

metadata:

  name: app-rolebinding

  namespace: project-hamster 

roleRef:

  apiGroup: rbac.authorization.k8s.io

  kind: Role

  name: app-role 

subjects:

- namespace: webapps 

  kind: ServiceAccount

  name: processor

EOF

crossplane examples

 https://github.com/crossplane-contrib

Creating EKS cluster

 https://docs.aws.amazon.com/eks/latest/userguide/create-cluster.html

Checking EKS status using aws cli

 

aws eks describe-cluster \

    --region us-east-1 \

    --name my-cluster \

    --query "cluster.status"

Creating EKS using aws CLI

 aws eks create-cluster --region us-east-1 --name my-cluster --kubernetes-version 1.22 \

   --role-arn arn:aws:iam::73095:role/AmazonEKSClusterRole \

   --resources-vpc-config subnetIds=subnet-0814938360f2fdf5b,subnet-040ad1e2b5ffe4775

KUBE master setup

 root@kubernetes-master:/home/ubuntu# history

    1  swapoff -a

    2  exit

    3  swapoff -

    4  swapoff -a

    5  rm -rf /swap.img

    6  exit

    7  sudo apt update

    8  sudo apt install docker.io

    9  sudo systemctl enable docker

   10  sudo systemctl start docker

   11  sudo systemctl enable docker

   12  sudo apt install apt-transport-https curl

   13  curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | sudo apt-key add

   14  sudo apt-add-repository "deb http://apt.kubernetes.io/ kubernetes-xenial main"

   15  sudo apt install kubeadm kubelet kubectl kubernetes-cni

   16  sudo swapoff -a

   17  vi /etc/fstab

   18  sudo hostnamectl set-hostname kubernetes-master

   19  sudo kubeadm init

   20  mkdir -p $HOME/.kube

   21  sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config

   22  sudo chown $(id -u):$(id -g) $HOME/.kube/config

   23  kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml

   24  kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/k8s-manifests/kube-flannel-rbac.yml

   25  kubectl

   26  kubectl get pods --all-namespaces

   27  kubectl get nodes

   28  kubectl get pods --all-namespaces

   29  kubectl

   30  sudo swapoff -a

   31  kubectl get nodes

   32  sudo -i

   33  kubectl get nodes

   34  ufw allow 6443/udp && ufw allow 6443/tcp

   35  kubectl get nodes

   36  sudo -i

   37  strace -eopenat kubectl version

   38  kubectl get nodes

   39  kubectl

   40  sudo dockerf ps

   41  sudo docker ps

   42  kubectl get src

   43  reboot

   44  kubectl get nodes

   45  history